David, I love those questions.  Thanks for posting them.
Driving the wrong direction - Our local Target store is entered from the street by driving up a steep ramp that leads in a straight line up to the fourth floor of the parking garage.  There is a similar exit ramp that starts from the third floor and goes straight down to street level, and opens next to that previously-mentioned entrance.  Well, last year, I unintentionally drove UP the DOWN ramp and got nearly halfway up, unawares, when a car started down toward me.  Oh Geez!  I had to back down.  MiniMeno reminds me of this experience nearly every time we go there, even though it was at least a quarter of her life ago.  
